Create a new temp file after contact photo is updated

So that subsequent photo selections (either take new photo
or choose new photo) add a new uri/bitmap pair to the cache.

In the full contact editor this happens when we bindEditors
is called after a photo is selected -- which leads to all
PhotoHandlers being recreated.

Bug 20562525

Change-Id: Id928dde5319928f72a1f9c1e038cf93e941824af